ADP-Based Supplementary Design for Load Frequency Control of Power Systems

Abstract

Randomness from the power load demand and renewable generations causes frequency oscillations among interconnected power systems. Due to the requirement of synchronism of the whole grid, LFC has become one of the essential challenges for power system stability and security. In this chapter, by modeling the disturbances and parameter uncertainties into the LFC model, we propose an adaptive supplementary control scheme for power system frequency regulation. An improved sliding mode control is employed as the basic controller, where a new sliding mode variable is specifically proposed for the LFC problem. The ADP strategy is used to provide the supplementary control signal, which is beneficial to the frequency regulation by adapting to real-time disturbances and uncertainties. The stability analysis is also provided to guarantee the reliability of the proposed control strategy. For comparison, a particle swarm optimization based sliding mode control scheme is developed as the optimal parameter controller for the frequency regulation problem. Simulation studies are performed on single-area and multi-area benchmark systems, and comparative results illustrate the favourable performance of the proposed adaptive approach for frequency regulation under load disturbances and parameter uncertainties.